1/*	$NetBSD: longjmp.c,v 1.1 2005/09/17 11:49:39 tsutsui Exp $	*/
2
3/*-
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christian Limpach and Matt Thomas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34#include "namespace.h"
35#include <sys/types.h>
36#include <ucontext.h>
37#include <signal.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include <machine/regnum.h>
42
43void
44__longjmp14(jmp_buf env, int val)
45{
46	struct sigcontext *sc = (void *)env;
47	ucontext_t uc;
48
49	/* Ensure non-zero SP and sigcontext magic number is present */
50	if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != 0xACEDBADE)
51		goto err;
52
53	/* Ensure non-zero return value */
54	if (val == 0)
55		val = 1;
56
57	/*
58	 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK.
59	 *
60	 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK,
61	 * since libpthread may want to interpose on signal handling.
62	 */
63	uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
64
65	sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
66
67	/* Clear uc_link */
68	uc.uc_link = 0;
69
70	/* Save return value in context */
71	uc.uc_mcontext.__gregs[_R_V0] = val;
72
73	/* Copy saved registers */
74	uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0];
75	uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1];
76	uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2];
77	uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3];
78	uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4];
79	uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5];
80	uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6];
81	uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7];
82	uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8];
83	uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP];
84	uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA];
85	uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc;
86
87	/* Copy FP state */
88	if (sc->sc_fpused) {
89		/* FP saved regs are $f20 .. $f31 */
90		memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20],
91		    &sc->sc_fpregs[20], 32 - 20);
92		uc.uc_mcontext.__fpregs.__fp_csr =
93		    sc->sc_fpregs[_R_FSR - _FPBASE];
94		/* XXX sc_fp_control */
95		uc.uc_flags |= _UC_FPU;
96	}
97
98	setcontext(&uc);
99 err:
100	longjmperror();
101	abort();
102	/* NOTREACHED */
103}
104